Computing ob multiplying machine



Jan. 5 1926. 1,568,800

C. C. COSS COMPUTING OR MULTIPLYING MACHINE Filed August e, 1924 5 SheetS-Sheetl l @14mm/NCQ@ Jan. 5 1926. 1,568,800

c. c. coss COMPUTING OR MULTIPLYING MACHINE Filed Augus?I 6, 1924 5 Sheets-Shui 2 C [are C'. Cass Summa Jan. 5 1926. 1,568,800

C. C. COSS COMPUTING OR MULTIPLYING MACHINE Filed August 6, 1924 5 Sheets-Sheet 5 M SQ NCV/araco.

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, c. c. COSS COMPUTING OR MULTIPLYING MACHINE Filed August 1924 5 Sheets-Sheet 5 Patented Jan. 5, 1926.

UNITED sTATEs PATENT OFFICE.

CLARE C. COSS, OF GRAND RAPIDS, MICHIGAN ASSIGNOR OF ONE-HALF TO HOWARD E. JAMES, OF LAKEv CITY, MICHGAN.

COMPUTING 0R MULTIPLYING MACHINE.

f Application led August 6, 1924. Serial No. 730,514.

To all lwhom t may concern:

Be it known that I, CLARE C. Goss, a citizen of the United States, residing at Grand Rapids, in tliccounty ot Kent and State of hichi'gan, have invented certain new and useful Improvements in Computing or Multiplying'Machines, of which the following is a specification.

My invention relates to improvements in computing machines, and it has for its object the multiplying of one number, or series of numbers by another number or series of numbers and recording the proper prod uct 'of said multiplication.

l attain this object by the mechanism and operation of parts shown and indicated in the accompanying drawings, in which Fig. 1 is a sectional side elevation of my machine taken upon the line 1-1 of Fig. 2. Fig. 2 is a plan of my machine with the front end of the cover removed to show the relative positions of the several operating elements of the machine. Fig. 8 is a sectional iront elevation ot the machine looking to the right from the line 3-3 of Fig. 2. Fi 4C is a sectional elevation of the back en ot the machine looking to the left from the line 4.--4 of Fig. 2. Fig. 5 is a sectional elevation of the machine looking to the right from the line 5e-5 of Fig. 2. Fig. 6 is a front elevation of the recording discs in the 'inachine, and of their several operative parts, detached from the case of the machine. Fig. 7 is a side elevation of the frontend of the machine showing a groove in which the disc carrying shaft is moved Jforwardly and backwardly when operating the machine. Fig. 8 is a side elevation of the several connecting bars that carry the recording discs and their actuating elements. Figs. 9 and 10 are dctached elements in the make un of the several elements shown in Fig. 8.l Fig.11 is a is a sectional elevation of the discs on the line 17-17 of Fig. 14.- with the auxiliary operating elements removed and the direct operating gear wheels in place. Fig. 18 is an extended View of the periphery of the recording discs showing the recording iigures thereon, Fig. 19 is a side elevation of one of the direct actuating gears showing a pawl thereon for actuating an adjacent disc. Fig. 20 is an enlarged sectional view on line 17-17 of Fig. 14.

Similar reference characters indicate similar parts throughout the several views.

ln the construction of this machine ll provide a case 1 having a broad front part tor the storage and proper movements of the recording discs and their immediate operating parts crosswise of said front, to be hereinafter fully explained; and a narrow back part for the storage and proper operation of the operating levers 3, to be hereinafter fully explained in connection with their manner of operating the recording discs, etc. rll`his case has a detachable cover 1 with which it may be enclosed so as to protect the working parts of the machine from injury from outside causes, as the over collection of dust, and other foreign material.

Within the frame is constructed a series ot partitions composed of the posts 5 and 5 and the cross girts 5, the latter bein provided with slots d centrally located an extending longitudinally thereof for the reception and free movement of the bar 8, which also passes through the slots c in the operating levers 3, and the slots f-f in the regulating arms 6 and 6.

The arm 6 is mounted upon the shaft 7 which shaft passes through the machine and has the arm 6 mounted upon the other end thereof, as indicated in Fig. 15. The arm 6P is contained wholly within the machine case, but the arm 6 passes upwardly through the case, and through the slot in the cover et the case, Within easy reach ot the operator oiE the machine forming a lever tor regun lating the position oi the bar 8. The guree, 1, 2, 3, t, etc., indicate .the numbers that are to be multiplied by, or, the igures in the multiplier, and the lever 6 is set at the figures that the multiplicand is to be multi7 is being carried on* plied by, progressively, as the multiplication/4 The operating levers 3 have segmental heads 3 thereon, made integral therewith, and provided with gear teeth e, designed to meshwith the gear wheels 9 for revolving the discs 9, to be hereinafter more fully described. Each lever 3 has a longitudinal slot c therein for the passage of the bar 8, as hereinbefore described, and the head 3 has a segmental slot ctherein for the passage of the shaft 4, which is located directly back of the centers of the discs 9 and should exercise a slight degree of friction upon the head 3 for the purpose of holding the head always in the exact proper position, relative to the gear wheels 9 to always mesh freely therewith, no mattei' what may be the position, vertically, of the head, or the position, longitudinally, of the girt 5. of the bar 8. It will be understood that with the back end 3 of the levers 3 held in fixed position by the gage rod 42 that adjusts the end of the lever` to the multiplicand figure oi' numeral, the movement of the bar 8, longitudinally of the slot d will cause the heads 3 of the lever to raise or lower accordingly.

ll will now take up the description of the manner of manipulatingthe ends 3 of t-he levers 3 for adjusting it to the desired numerals in the multiplicand column ot figures. rlhe gage rods 42 are adjusted to hold the ends 3 of the levers 3 in the proper positions by means of the triangular guides 45, which are slidingly mounted upon the corresponding partition post 5 in such a manner that they may be moved longitudinally of the case. as desired. Each guide has a thin neck 45 which terminates in an overlapping headr 46 that rests upon the bearing 46', and has a spring latch 47 securely supported thereon and arranged to interlock with the desired notch. 7". in the 'bearing 46. rlhe neck 45 passes through the slot a, in the top of the machine case` and one of said guides 45 and Iguide rods 42 are provided to act with each operating lever 3, thus each of said levers, of which there are nine, are operated independently ofthe other so far as the action of the guide 45 is concerned, though all of the levers 3 that are to be operated at a given time are actuated at once by the operation of the actuating lever 6 and the bar 8. The gage rod 42 is slidinglv mounted in a sui porting head 40 which is pivotally mounted upon the bearing 40 so the rod may be drawn over out of contact with the end of the lever, as indicated by the dotted lines in lfjigal. Each head 40 has a baclrwardly projecting arm 4l which is engaged b v the connecting rod 39 with an angle lever 23. pivotallv mounted on the shaft 28. which is connected with the lever 24 bvgmeans of the connecting rod 27. ilhe lever 24 is pivot-ally connected with the ease at 23 and held in' position against the gear wheel 3l,

by the spring 23, in such a manner that when the lever 32 is carried forward into the position indicated at 32 the corresponding bearing 30 will be removed from behind "the lever 24 and the spring 23 will draw the said lever backwardly upon the smaller hub periphery of the gear wheel 3l and the angle lever 28 will beoperated to draw downwardly upon the connecting rod 39 and thus swing the head 4() around into the posit-ion hereinbefore described to free the end of the levers 3. Each gage rod 42 is held in normal longitudinal position in the head 40 by means of a spring 43, and is provided, at its upper end, with an antifriction wheel 44 to travel upon the surface of the guide 45 with as little friction as possible.

`Wlien the lever (l has been set to the dcsired multiplying ligure, and the correspondingl \y sliding `guide 45 has been properly set with the latch 47 engaging the desired notch -7.A iu the plate. 4G the lever 32 is drawn forwardly until it reaches the position indicated at 32. when the head 40 will he swung over and the gage 42 will he rcinoved from the end 3 of the lever 3. Then the lever 32 is drawn further toward the position indicated at 32 and the desired gear teeth on the wheel 3l will be made to mesh with the `gear wheel 33. which gear wheel. meshing with the gear wheel shown in outline at 33. will cause the hub to revolve. and. with it. the cams 34 will be revolved into position to act upon the levers 37. pivotally mounted in the case at 37. and connected with its respective lever 3 bv means of connecting` rods 5G, (there being one of these levers. and of the cams 34 for each lever 3) and the corresponding lever 3 will he thrown around upon the bar 8 so that the gear teeth c on the heat 3 will mesh with the teeth on the gear wheels 9 and will revolve the discs 9 into desired positions. as will be hereinafter more fully described.

The discs 9. and the gear wheels 9 are mounted upon the shaft l0. which` in turn, is mounted in bearings at the lower ends of the swinging arms 17. the latter beingpivotally mounted upon the sides of the ease l at m so the lower ends thereof may be made to swing` toward. and away from the heads 3 of the lever 3. rllie lower end oi" these arms are pivotally, and slidablv connected with the arms 2l. as at ,57. and the levers 2l are connected with the lever 24 b v means of the connecting rod 43 which is pivotallv connected with the crank arm 49. as at 30. and with the arm 2l. as at 30'.. that when the lever 32 is drawn forward a proper distance the arm 24 will draw the lever 2l, and with it the arm 17,. and the discs and gear wheels on the shaft lO. into position so the gear wheels 9 will be made to lll() mesh with the gear teeth e on the heads 3" of the levers 8 simultaneously with the swinging movement of the head 110, thus holding the levers 3 temporarily in place, so that. when the said levers are made to oscillate upwardly and downwardly, as hereinbefore described, the gear Wheels and discs on the shaft 10 will be made to revolve according to the relative positions of the bar 8, governed by the-position of the lever (3, and of the gage rod L12, governed by he position of the sliding guide plate 15, which governs, positively, the distance to be traveled by the head 3 of the lever 3, and the relative revoluble movement of the discs 9. Upon the periphery of the discs 9 is imprinted the first ten Arabic' numerals, as indicated in lig. 1S. ylhe discs 9 and the gear Wheels 9 are so mounted upon the shaft 10 that they may be made to revolve independently of each other on the shaft. Pins 7L are made to project from the inside of the two outside discs 9 and from both sides of each of the intermediate discs, and in one side of each disc except the left hand disc form an opening 5s having ratchet teeth 541', and pivotally mount a pavvl 55 upon the gear Wheels 9 in position to freely enter the openings 511 and engage the ratchet teeth therein, as shown in .digs 1a and 19, more particularly in Fig. 17. The gear Wheels 9 are made to revolve separately from the discs 9, when desired, so that the discs may be carried around into normal positions, after each impression is taken, by revolving the shaft 10 until the paWls 55", mounted in the openings in the discs, are made to engage the slot o in the shaft 10 when the revoluble movement of the shaft will carry each disc into its exact normal position. l provide a second set of g ar Wheels, 11 and 11, made integral. Wheels 11 have a series of teeth 19 havi valleys between them corresponding vvthe gear pins h on the discs so that these Wheels revolve `with the adjacent discs, While the Wheel 11 has but one tooth, 19, which revolves the adjacent left hand disc one tooth with each full revolution of the hand discs. rlhe gear teeth 19 on the Wheels 11, and the pins I, on the discs must correspond, exactly, with the numerals imprinted upon the peripheries of the discs, to insure correct computations.

The paw s 55 are actuated to properly engage the slot o in the shaft 10, by means of a properly mounted spring, as indicate L at p in Fig. 14, and the pawl 55 is lilrewise actuated by sprocket teeth 54V.,

l The gear Wheels 11-11 are mounted upon a shaft 112 which, in turn, is mounted in the swinging arms 12, the upper ends of said arms being pivotally mounted upon the shaft 10, and thelovver ends being slidu a spring ,7c to engage ingly mounted upon the shaft 50, which latter is revolubly mounted in the case 1. ller actuating the shaft 50 through the swinging movements of the arms 12 @i form a groove g in the lower surface of the shaft and insert a sliding key r therein and in corresponding groove in the bearings of the arms-12 so the shaft must respond to each swinging movement of the arms. The upper surface of this shaft has notches y and g formed thereon, so arranged that when the arms 12 are nearly to the extreme, relatively, left hand, or outward position the trip 57 will slide off of the notch g/ against the notch g just before the impression is made upon a receiving 'sheet 13', and when started back into position to engage the teeth e on the actuating heads 3 the trip will slip off of the notch g and be moved along, with the 'several discs until it engages the next notch g, and so on to the end of a problem. This is brought about by the spring 20 in the case 20', and the shaft 53 .upon which the pulley 51 is mounted. rlhe ribbon 52 is mounted upon the pulley 51 With the other end connected with one of the arms 12, so that as soon as the latch 57 is freed from either notch, g or g', the arms l2 and the several discs and gear Wheels are drawn' along to the next notch, and so on to the end of the pending problem. lt will be readily understood that this action of the machine will require a shaft 10 of suiiicient length to be moved endvvise in the case the length of the frame 12-12, as indicated by the dotted outlines of said frame and the discs in Fig. 5. 1t will, also, be understood that the sideivise movement of the shaft 10, as hereinbefore described, will require the use of properly formed slots a in the sides of the case 1, as indicated in Fig. '.7..

'lo complete the operating construction of this machine l place a paper roll 13 in the oase, and asprinting roll 14 directly above the paper roll, over Which the paper 13 passes to receive the imprints from-the discs 9 as they are forced against the paper with the action of the lever 32 when thrown bachuardly into normal position and the arms 21 and 17 are thrown forward by the action of the lever 2d through the connecting;` rod 118. A t 15 l have shown afpressure roll'for holding the paper securely upon the surface of the roller llfiwhen said roller is being` made to revolve by means of the links 1G and the pawl and ratchet mechanism shown at 16', actuated by the swinging movements of the arms 17.

.ln Fig. 13 l have shown a diagrammatical outline of the operation of the machine. `We

lwill suppose that 9 is being multiplied by any one of the numerals in the multiplying column, and We have all of the quotients from 9 to 81. lf 9 is being multiplied by S the quotient being 72, the 2"vvill be imprinted upon the paper by the right hand operating disc and the action of the tooth 19 on the Wheel 11 upon the next adjacent left hand disc will so place the dial that it will imprint the 7, and so on throughout a multiplying process. v

To further carry outA this illustration, We will presume that the back end of the lever 3 is placed at 6, if multiplied by 3 the quotient 13 will be registered. lf by 6, 36 will be registered, and if` by 9, 54 will be registered, and if the numeral 3 is multiplied by 6, 18 will be registered, and if by 9, 27 will be registered as the proper quotients, and so on throughout the entire vline of multiplication. l have made use of the above mentioned numerals as multiplicands as they may all be readily registered in the same diagram, but the result must be the-same, no matter what may be the multiplier or multiplicand.

lt will be readily understood that with the shaft 10, and the discs and their actuatingmechanism in their normal positions, as indicated in Fig. 2, it is an easy matter to adjust themlongitudinally of the front of the case, as indicated by the dotted outlines in said Fig. 2. p

rllhe arms 21 are actuated by the connecting rod 48 which is connected at one end with the lever 49 on the shaft 26 that carries the crank arm 49, as at 30, and at the other end with the arm 21, as at 3Q on Figs. 1

and 2, there being one arm, 21, in the case at each side thereof, on the shaft 22, the rod 43 being connected with the arms 49 and 21 at the relatively upper side of the case, as indicated in Fig. 2'. This connection is made, preferably, partly outside of the case as indicated in Fig. 1 and shown in Fig. 2, and, as hereinbefore stated,`the arms or standards 17 are actuated by the arms 21 to carry the discs 9 toward, and away from the lever heads 3.

. Coming, no w, to the process of multiplication, we take the problem 4836 as a multiplicand, and 346 as the multiplier. To make this multiplication the first four members 45 at the right hand side of the machine, nearest to the lever 32,- are placed in the positionsv indicated by the numerals 4, 8, 3, 6, these being the multiplicand numerals, and the lever 6 is carried over to 6 in its index column, and remains there until the lever 32 has been swung over into the position indicated at 32'. and back into normal position at 32, then the lever 6 is placed at 4, and the lever 32 is again carried over to 32 yand back again to normal; then the lever 6 is placed at 3 and the action repeated and the last quotient embodies the sum of all three quotients. ln other words, each succeeding quotient after the first includes the sum of all preceding quotients,

= and when the last figure in aflmultiplier has Laeaeoo been exhausted the product will include the sum of all of the'multiplications.

lt is to be understood that there is one cam 34 for each lever 3, and that these cams are so distributed that the first lever is fully operated before the next succeeding cam acts upon its respective lever, and so on throughout the entire series. rlhat is to say, if a multiplicand contained the entire ten digits in i'trabic numerals, and` the members 45 are set accordingly, when the lever 32 is swung over toward the front of the machine each lever 3, beginning at the right hand side of the machine, as shown in lig. 6, will perform its full operation before the next succeeding lever will be affected by its actuating cam 34, thus the lever 32 will, necessai-ily, be carried over toward the front of the machine, or, rather, toward the position indicated at 32 far enoughto operate the same number of levers 3 as there are figures in the multiplicand, counting the action of one cam upon the levers 3 for each figure in the multiplicand.

rlhis brings us to the mattei' of carrying over a surplus from one multiplication to the next figure in a product, which is as follows: Using the problem given above with 4836 placed as the multiplicand, and the lever 6 placed at the figure 6 in its index, for the first multiplication, the lever 32 is thrown over toward the point 32 or 32 far enough to actuate all of the levers covering these figures. Upon the first movement of the lever 32, and before the first cam 34 takes effect upon its corresponding lever 3 the lever 24 will be released and the spring 23, and connecting rod 48 will draw the shaft 10 intol position so the gear wheels 9 will be engaged by the head 3 of the lever 3, then, as the lever is drawn further forward, the cams 34 will act upon the levers 37 successively, and the downward movement of the heads 3 will revolve the gear wheels 9 and with them the discs 9, but each disc will complete its revolutions before the next succeeding disc is acted upon at all by the heads 3. When the first head 3 is forced downwardly it causes the first disc 9 to revolve three full revolutions and six points over thus placing the dise in position to imprint the figure 6 uponv the receiving pad, or paper, 13. Each completerevolution of the first disc causes the auxiliary gear 11 to revolve one revolution, and the single tooth 19 will move the next succeeding disc one tenth of a revolution, hence the three full revolutions of the first disc will turn the next succeeding disc three tenths of a revolution. As the lever 32 is brought further on its course forward the first disc remains in place and the second dise is made to revolve three full revolutions and eight tenths of another revolution, which added tothe three tenths of a revolution caused by the over nseaeoo movement of the first disc, brings the disc in position to imprint the ligure 1 upon the paper 13', and so on until the rst quotient of 4836 multiplied by 6, namely: 29016 are in position to be impressed upon the paper, when the return of the lever 32 into normal position will force the shaft 10 forward into position to bring the discs in contact with the paper 13' and record the said product thereon. After this product has been recorded the lever o will be placed upon the dial number 8 and upon the first forward movement of the lever 32 the disc will be slightly removed from the receiving paper 13 and the shaft 5() will be turned into position to allow the discs and their supporting frame` to slide one notch to the right when the same process is repeated except that the second product covers the two multiplicationsaand so on to the end of the eaample, the final product giving the sum of all of the multiplications added together.

llt is evident that if a large numeral is to be multiplied by a large numeral, as 9 n 9, it will require much greater travel by the head 3 of the lever 3 to properly adjust the discs 9, than if a small numeral is to be multiplied by a small numeral, as 2 X 3, and this is provided for by the position of the bar 8 thus: lf multiplying by 9 the lever 6 is placed at 9 and the distance from the shafts 8 to the end 3 of the lever 3 is diminished and that from the bar 8 to e, on the head 3', is increased so as to compel the head 3 to move its entire length, but if the multiplier is 2 the lever 6 is placed at 2 and the distance from 3" to the bar 8 is increased, and the distance from the bar 8 to e is proportionatelydecreased and the movement of the head 3' is lessened accordingly, and so on throughout the multiplier column.

Upon first thought cit may be objected that the variations in the lengths of the radial lines between the shaft 8 and the head 3^ with the bar 8 placed at the extreme right khand position and the eXtreme left handv position in the slot d would so vary the necessary curvature of the head 3 as to render the fixed curvature of the slot o' inoperative except with the bar 8 in one xed position, but this variance is fully compensated for: first by the shaft or pin 4, which holds the heads at all times in the same relative position with the gear wheels 9 when these wheels are in position to properly mesh with the gear teeth upon the head 3 of the lever 3, and, second, by the slight longitudinal movement of the lever 3 provided for in the use of the slot o upon the bar 8, which allows the bar 8 to remain' stationary as a pivotal center, no matter in what position it may be 1n the slot ci, during the entire vertical movement of the head 3', either upwardly or downwardly while operating the discs in f the process of any problem in multiplication To compensate for the longitudinally sliding movement of the arm 17 upon the arms 12 and 21, when they are being swung to-t ward or away from the head 3' of the lever 3, l form slots in the upper ends of the arms 12 and 2l, as shown in Figs. 8 and 9, so that the shafts 10 and 10 may slide therein 'to allow of the free lateral swinging of the arms 12, 17 and 21.

'l'he discs 9 and the gear wheels Qand 11-11 should fit upon their respective shafts closely enough to avert the danger of their being made to revolve thereon independently of the action of the head 3', so that when any of the gear wheels are thrown out of mesh they will retain their position upon the shaft to properly mesh when again brought together; but they should not nl' closely enough to prevent their freegmovement upon the shafts when being made to revolve thereon by the head 3', or when being slid longitudinally of their shafts towards and into the positions indicated by their dotted outlines inplFig. 5.

Having thus ful-ly described my invention, what l claim as new` the art, is:

1. ln a computing machine, an enclosing case, a shaft mounted crosswise of thel case, operating arms mounted on said shaft and having slots therein, one of said arms passing upwardly 'through the cover of the case forming an actuating lever, partitions in the case having horizontally disposed slots therein, operating levers each having curved heads thereon and gear teeth on said heads, the levers and the heads each having slots therethrough, a bar passing through the slots in the partition, in t-he operating arms, and in the operating levers for supporting and adjusting the operating levers, a shaft near the back end of the machine, a segmental gear wheel on said shaft, a lever for operating said shaft, cams revolubly mounted in the case back of the said lever in position to be operated by the segmental gear wheel, levers and links connected to operate the operating levers from said cams, arms swingingly mounted in the case, shafts mounted in the free ends of said arms, and discs and gear wheels mounted on said shafts in position to be made to revolve by temporary engagement with the heads on the operating -evers 2, lln combination with the-elements covered in claim 1, a short vertical'lever pivotally mounted in the case, a shaft upon which said lever is mounted, passing through the case and having a short lever upon the other end thereof, an odset upon the segmental gear in position to actuate said vertical lever, holding it in normal positionwhen contacting it and releasing it when removed from contact therewith, a spring connected with the vertical lever to draw it out of normal ltll) position when released from the odset on the segmental gear, and a connecting rod connecting the shorter lever with the swinging arms or swinging the disc gear into and out of mesh with the teeth on the operating lever heads.

3. A computing machine according to claim 1, in which the said lever and links connected to operate the' operating levers from said cams, comprise a lever mounted in the case directly in the line of travel of 'each cam, one end of said levers pivotally mounted in the case and the other end connected by a link with the ends of the operating levers, and guides for adjusting said operating levers into operative positions.

4. In combination with the elements covered in claim 1, a vertically disposed lever pivotally mounted near the back end of the case, an oset on the hub of the segmental gea-r for holding said lever in normal position, a spring for drawing said lever out oi' normal position when said odset is removed from contact therewith, an angle lever pivotally mounted in the caseiback of the vertical lever, a rod pivotally connected with the lower end of the verticallever and with the short arm of the angle lever, a gage head pivotally mountedin the case directly over the back end of each operating lever, an arm extending backwardy from the pivot-al bearing of each of said heads, a connecting rod pivotally connected at one end with the end of a gage arm and at the other end with the long arm of an angle lever in such a manner that the swinging movement 'of the vertical lever will swing the gages into and out of contact with the ends o3 the operating levers, and guides for regulating the positions of the gages.

5. ln combination with the elements covered in claim l, gage heads pivotally mounted in .the case immediately above the ends of the operating levers, a longitudinally movable gage rod mounted in each gage head, a spring for holding each of said gage rods in normal position in its head, means for throwin the gage heads over to remove the gage rods out of contact with the ends of the operating levers, guides for holdingvthe gage rods in position upon the ends of the operating rods, and antifriction rollers in the ends of the gage rods to reduce friction when they are being swung onto or ofi of the guides.

6. In combination with the elements covered in claim 1, gage heads pivotally mounted in the case above the ends of the operating levers, guides for iixing the positions of the gages, said guides made triangular inform and having necks extending upwardly 'therefrom through slots in the case cover, a head extending sidewise from each of said necks, indented gages upon the case cover adjacent to heads, the indentions arranged to indicate the several numerals in a multiplicand, a latch upon each head arranged to be made to engage 'the desired indentions in the indented gages.

7. A machine according to claim l, in which the heads 0f the operating levers have slots formed therethrough, and a bar is passed through the case and through the said slots for holding the heads in uniform relative positions with the gear wheels between t-he discs.

8. A machine according to claim 1 in which the arms swinginghv mountedin the case and the shafts mounted 'therein comprise a pair of swinging arms pivotally mounted in the top of the case and depending downwardly, a pair of swinging arms pivotally mounted in the bottom ot the case and extending upwardly to Contact with the free ends of the upper arms, said lower arms having slots through the upper ends, a shaft revolubly mounted in the ends of the upper arms and passing through the slots in the lower arms, for carrying the discs and their connected gear wheels, a shaft mounted near the free ends ot' the lower arms, gear wheels mounted upon the said shaft in position to intermesh with the gear wheels on the recording discs, and means for swinging said arms to cause 'the disc gears to y intermesh with, and to he released from the gear teeth on the operating lever heads.

Signed at Grand Rapids, Michigan, July ie, 1924.

CLARE C. COSS. 

